Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 455

M x
I x y ¼

105,909,000
150 800 3

12 400 ¼ 6

: 62MPa

=

M y
I y x ¼

100,620,000
800 150 3

12 75 ¼ 33

: 54MPa

=

f max ¼ 36 ð : 95 + 6 : 62 + 33 : 54 Þ ¼ 77 : 11MPa < 340MPa ThenO ð : K : Þ

4.6.3.27 Design of Joint J 1
It is now possible to design the joints of the main trusses after designing all
members and knowing all details regarding the joints. Let us start by design-
ing joint J 1 (see Figure 4.212 ) . For M27 high-strength pretensioned bolts
used, the following design values are calculated:
F v,Rd ¼ 176 kN (single shear) and 353 kN (double shear)
F s,Rd ¼ 117 kN (single shear) and 234 kN (double shear)
F s,ult ¼ 103 kN (single shear) and 206 kN (double shear)

Number of Bolts for the Vertical Member V 1
N V ðÞ¼

F Ed
F s , ult ¼

4433 9

206 ¼ 21

:

: 5 bolts, taken as 24 bolts (12 bolts in each side

acting in double shear)

Number of Bolts for the Diagonal Member D 1
N D ðÞ¼

F Ed
F s , ult ¼

6203 9

206 ¼ 30

:

: 1 bolts, taken as 32 bolts (16 bolts in each side

acting in double shear)

4.6.3.28 Design of Joint J 2
Following the same procedures adopted for the design of joint J 1 , we can
design joint J 2 (see Figure 4.213 ) using the same M27 high-strength preten-
sioned bolts as follows.

Number of Bolts for the Vertical Member V 2
N V ðÞ¼

F Ed
F s , ult ¼

1878 6

103 ¼ 18

:

: 2 bolts, taken as 20 bolts (10 bolts in each side

acting in single shear)

4.6.3.29 Design of Joint J 3
Joint J 3 (see Figure 4.214 ) can be designed using the same M27 high-strength
pretensioned bolts as follows.

Number of Bolts for the Vertical Member D 2
N D ðÞ¼

F Ed
F s , ult ¼

4706 6

206 ¼ 22

:

: 8 bolts, taken as 24 bolts (12 bolts in each side